Here is my first report on Pulstar spark plugs that I recently installed. I found a coupon code on another forum (that unfortunately expired last month) that lowered the cost to $163.00 for 8 plugs shipped. I set the gap to factory specs, and unhooked the battery during install to reset the computer. The cost over iridium plugs is about $100.00 more for the set. As I have no access to a dyno, I realize all is subjective. Idle seems very smooth with less hesitation when power is needed. I consistently go 325 miles before the low gas light goes on in mostly city driving for my daily commute. With the Pulstars, my first tank went 365 miles. If this holds, I figure that to be a 12% increase. And again, if this holds, I figure the plugs will pay for themselves in about 12 fillups. The plugs I am replacing have less than 5000 miles on them, and did slightly improve my mileage when I put them in. I haven't made any other changes recently. As mileage is very dependent on many factors I will keep you apprised of future mileage figures. Good luck to those willing to try them out.